probably the better question to ask is - "which DAP should i avoid because it sounds like crap?"
honestly, all the above suggestions do NOT sound like crap, so base your decision on other factors - portability, ease of use on the go and at home, battery life, extra ins/outs, EQ, whatever bells and whistles would push you over the edge - or lack thereof. that way you feel like you custom tailored your decision on what you want, and it doesn't hurt that the tunes sound good too.
example - in my personal choices, i want to keep the whole portable experience as painless as possible when i'm on the comp, but on the go i dont mind a bit of bulk. thus, a DAP with a portable amp is the way i travel, and at home i use itunes to load it up and go.